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United States Patent | 5,217,606 |
Ramponi ,   et al. | June 8, 1993 |
An oil filter for providing coarse and fine filtration of lubricating oil in an internal combustion engine is disclosed herein. The oil filter includes a cylindrical housing closed by a cover containing a coarse-filtering cartridge of pleated paper included between a lower plate and an upper plate, and a fine-filtering cartridge placed between the coarse-filtering cartridge and the cover. The fine-filtering cartridge is supported between a lower base plate and an upper base plate arranged to bear against the cover. Both filtering cartridges have a cylindrical shape with axial recesses extending therethrough. The fine-filtering cartridge is composed of a band of filtering paper disks, the band being bent as an accordion. The upper base plate is integrally formed with to a first end of a barrel with the barrel coaxially extending through the axial recess of said fine-filtering cartridge and partially into the axial recess of said coarse-filtering cartridge. The filter includes means for fixedly attaching the upper plate of the coarse-filtering cartridge about said barrel, with the lower base plate being slidably attached about the barrel. A helical compensating spring is placed between the upper plate of the coarse-filtering cartridge and the lower base plate of the fine-filtering cartridge for compressingly stressing the fine-filtering cartridge towards said housing cover.
Inventors: | Ramponi; Claudio (Giaveno, IT); Casalicchio; Silvano (Bruino, IT); Gallino; Mauro (Grugliasco, IT) |
Assignee: | Gilardini S.p.A. (Turin, IT) |
Appl. No.: | 844139 |
Filed: | March 2, 1992 |
Nov 20, 1990[IT] | 67904 A/90 |
Current U.S. Class: | 210/136; 210/316; 210/352; 210/438; 210/440; 210/450; 210/492; 210/DIG.13; 210/DIG.17 |
Intern'l Class: | B01D 027/14 |
Field of Search: | 210/136,316,352,438,440,450,488,492,DIG. 13,DIG. 17 |
3353680 | Nov., 1967 | Niebergall | 210/440. |
4265748 | May., 1981 | Villani et al. | |
4738776 | Apr., 1988 | Brown | 210/DIG. |
5041221 | Aug., 1991 | Drusi | 210/493. |
Foreign Patent Documents | |||
0362554 | Apr., 1990 | EP. | |
608531 | Sep., 1948 | GB. | |
710621 | Jun., 1954 | GB. | |
773355 | Apr., 1957 | GB. |